Singh, Jitendra Pal Ji, Mi-Jung Shim, Cheol-Hwee Kim, Sang Ok Chae, Keun Hwa 2024-01-20T01:01:49Z 2024-01-20T01:01:49Z 2021-09-05 2017-08 1674-2001 https://pubs.kist.re.kr/handle/201004/122480 The role of the thermal history of the precursor was studied for amorphous and crystalline calcium carbonate phases synthesized from calcium nitrate. The X-ray diffraction patterns of these phases are influenced by their annealing temperature of 0, 300, 400, and 500 degrees C. However, the effect of the precursor thermal history on the X-ray diffraction pattern of the resulting calcium carbonate phase is negligible. Transmission electron microscopy indicates that materials annealed at 400 degrees C consist of amorphous aggregates, irrespective of the precursor thermal history. The crystallite size of crystalline calcium carbonate is influenced by the precursor thermal history, and ranges from 23 to 26 nm. Near-edge X-ray absorption fine structure measurements indicate that the annealing temperature plays an important role in determining the local electronic structure. The role of the thermal history of the precursor is also important for the resulting electronic structure. (C) 2017 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE INC BIOMINERALIZATION SPECTRA XANES EDGE NANOPARTICLES PARTICLES POLYMERS CACO3 Effect of precursor thermal history on the formation of amorphous and crystalline calcium carbonate Article 10.1016/j.partic.2016.10.003 1 PARTICUOLOGY, v.33, pp.29 - 34 PARTICUOLOGY 33 29 34 scie scopus 000405053100005 2-s2.0-85014025016 Engineering, Chemical Materials Science, Multidisciplinary Engineering Materials Science Article BIOMINERALIZATION SPECTRA XANES EDGE NANOPARTICLES PARTICLES POLYMERS CACO3 Amorphous material Particles Electron microscopy X-ray techniques NEXAFS Calcium carbonate